Ukraine turmoil

The conflict in Ukraine has deepened with Russian military forces reportedly moving to secure important sites in Crimea following the ouster of the country's pro-Russian president at the end of February. President Barack Obama said in a statement the U.S. is "deeply concerned" about the escalating situation. The violence that broke out Feb. 18 was the worst in the country's post-Soviet history.

Police detain a protester demonstrating against the Russian military's actions in Crimea and developments in Russian-Ukrainian relations during an unsanctioned rally in St. Petersburg, Russia, on March 2, 2014.